The prescription was for a patient named Alyshia Rego, she said. She would pick it up at the Walgreens at 9851 Glades Road in west Boca.

But a manager at the Walgreens noticed a red flag: "Amanda" had blocked her return number.

The manager told her she could come in and pick up the amoxicillin that night.

A woman later identified as Fedotova picked up the amoxicillin at 7 p.m., according to an arrest report.

But in order to get the Xanax, she would have to wait until the pharmacy manager confirmed the prescription with the doctor's office.

The next day, the pharmacy manager called the doctor's office and spoke with the office manager.

The prescriptions called in by "Amanda" were fraudulent, the office manager said.

The doctor's office manager then agreed to go to the Walgreens to watch surveillance footage of the woman who picked up the prescription.

It was a familiar face. The doctor's office staffer recognized Fedotova. That's because Fedotova used to work at the office. She was fired in August 2012 for phoning in a fraudulent prescription for hydrocodone, deputies said.

The Walgreens manager started getting calls from other nearby Walgreens, letting him know the same woman had been trying to obtain the Xanax at those stores.

Xanax is the trade name for alprazolam and is used to treat anxiety. Amoxicillin treats bacterial infections.

Fedotova, 27, of Boca Raton, was arrested Tuesday morning and booked into the Palm Beach County Jail and released that night on a $9,000 bond.

She was charged with two counts of obtaining a controlled substance by fraud, one count of forging a prescription and practicing medicine without a license.